Jambmaths question:
$\left| \begin{matrix} -x & 2 \\ 4x & 1 \\\end{matrix} \right|=\left| \begin{matrix} 3 & 3x \\ 4 & -5 \\\end{matrix} \right|$, find the value of x
Option A:
5
Option B:
2
Option C:
-2
Option D:
-5
Jamb Maths Solution:
$\begin{align} & \left| \begin{matrix} -x & 2 \\ 4x & 1 \\\end{matrix} \right|=\left| \begin{matrix} 3 & 3x \\ 4 & -5 \\\end{matrix} \right| \\ & -x-8x=-15-12x \\ & -9x+12x=-15 \\ & 3x=-15 \\ & x=-5 \end{align}$
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